app/testpmd: add bits per second to statistics
app/testpmd: add bits per second to statistics

Traffic bps statistics is very useful for performance testing.

Add bits per second statistics for Rx and Tx.

Signed-off-by: Matan Azrad <6969f5f553ad7652679a585a85d7321babc90464@mellanox.com>
Acked-by: Moti Haimovsky <80a8523d5618c6f0fd031ee0b739d4b98f1a6c5c@mellanox.com>
Reviewed-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

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